Solving a light box requires the player to manipulate the 8 switches beneath the 5 by 5 grid of lights. The object is to find the lights permanent on position with a random switch combination.

Finding the specific combination is primarily up to the player, though, there is a brute force method that will work if you find yourself stuck at this point in your Treasure Trail.
This is a part of our OSRS Treasure Trails Guide.
ABAC | ABAD | ABAC | ABAE | ABAC | ABAD | ABAC | ABAF | ABAC | ABAD |
ABAC | ABAE | ABAC | ABAD | ABAC | ABAG | ABAC | ABAD | ABAC | ABAE |
ABAC | ABAD | ABAC | ABAF | ABAC | ABAD | ABAC | ABAE | ABAC | ABAD |
ABAC | ABAH | ABAC | ABAE | ABAC | ABAD | ABAC | ABAG | ABAC | ABAD |
ABAC | ABAD | ABAC | ABAE | ABAC | ABAD | ABAC | ABAG | ABAC | ABAD |
ABAC | ABAE | ABAC | ABAD | ABAC | ABAF | ABAC | ABAD | ABAC | ABAE |
ABAC | ABAD | ABAC |